[1] Cape Arkona is a conspicuous bluff where the houses of Hopoi Mission Station are located.
[4] The 9th Division faced formidable natural barriers in the form of rivers swollen by recent rain.
They came to a halt at the Busu River, which could not be bridged for two reasons: the 9th lacked heavy equipment, and the far bank was occupied by Japanese soldiers.
On 9 September, the 2/28th Infantry Battalion led an attack and secured a bridgehead after fierce fighting.
[6] The Mission House at Hopoi served as a headquarters and supply base for the Australian New Guinea Administrative Unit which was led by (NX155085) Captain Ralph Geoffrey Ormsby.